Which two choices best describe call signaling and media flows? (Choose two.)

Which two choices best describe call signaling and media flows? (Choose two.)
A . A process used to connect two parties calling
B . Audio or video or both transferred between two parties during conversation
C . Protocol for end-to-end users
D . A flow of audio and instant messaging
E . All call control signals being delivered through a channel
F . Data telephony, over a data network such as the Internet

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Answer: AB